If Justin Bieber's inner circle can't persuade the musician to change his ways, perhaps another spat with The Black Keys' drummer Patrick Carney will do the trick.

In an interview with Rolling Stone on May 9, Carney described the pop star as a "fucking irresponsible asshole" for the way he responded to their initial dispute dating back to the 2013 Grammys.

Following those awards, Carney was asked about Justin Bieber being snubbed with zero Grammy nominations. "Grammys are for music, not for the money, and he's making a lot of money," Carney said at the time. "He should be happy."

"Justin Bieber, like a fucking irresponsible asshole, sicced 40 million Twitter followers on me because I paid him a compliment he didn't understand," Carney told Rolling Stone. "I'm saying that he should be grateful that he has a fucking career in music. And he shouldn't be fucking telling his followers to slap me, and then also be doing anti-bullying bullshit. It's so irresponsible."

After engaging with "Beliebers" after his original 2013 comments, Carney also told the publication he was being called a "f----t" with Bieber's fans "saying all of these things that are actually wildly inappropriate." But Carney didn't mince words regarding his thoughts on Bieber.

"I mean, Justin Bieber is a fucking moron," he told the publication. "And that's the gist of what I was saying." Carney, who said he feels "bad" for Bieber, also said everybody working with him "should be fucking embarrassed that they don't....No one is doing him any favors, you know?" The Black Keys drummer also added while he doesn't listen to Bieber's music the singer should be grateful for his success. "Like, really, you make millions of dollars playing music, you should feel fucking lucky."

Carney's final parting shot concerned Bieber's manipulative ways regarding his fan base and how Bieber responds to his string of questionable actions. "He's feeding them the Kool-Aid more and more," Carney said. "He pours it on heavy, though. It's so manipulative! And whoever taught him that that was OK, whoever's watching him and is like 'that manipulation is acceptable,' should really be ashamed of themselves."

On Friday evening Carney took to Twitter to comment regarding his statements on Bieber. Here's what he had to say:

The Black Keys, who just announced an extensive North American tour for later this year in support of their new album "Turn Blue," play a "Live On Letterman" webcast Monday, May 12 and appear on The Late Show with David Letterman the same night. The duo will appear on The Colbert Report the following evening.